Printing mechanism



2 Sheets-Sheet 1 INVENTO Nov. 7, 1939. F. L. FULLER PRINTING MECHANISM Filed Dec. 1, 1936 Nov. 7, 1939. F. L. FULLE 2,178,749

PRINTING MECHANISM Filed Dec. 1, 1936 2 Sheets-Sheet 2 lmllmm dill-mum m-mn Mllllll 7 INVENTO Main ATTO RNEY Patented Nov. 7, 1939 UNITED STATES PATENT OFFICE 7 2,178,749 PRINTING MECHANISM Frederick L. Fuller, West Orange, N. J., assignor to International Business Machines Corporation, New York, N. Y., a corporation of New York Application December 1, 1936, Serial No. 113,590

19 Claims.

10 mechanisms by operating mechanisms of the re-' ciprocating type.- Such forms of printing mechanisms by reason of their reciprocating movements are not capable of the extremely high speed printing operations desired and are further objectionable in that they are noisy in operation.

Another form of printing mechanism comprises printing wheels, usually of the gear type and printing from a gang of type wheels has proposed to be accomplished by forcing them against a platen. Where a gang of such wheels is employed in a number of about sixty to eighty in tabulating machines the type wheels are carried by shafts in sub-groups for evenness of printing.

For further securing even printing operations it has been proposed to carry each type wheel by an individual member whereby the unevenness of a platen or surrounding paper strip can be overcome.

However desirable are the characteristics that may be derived by the last mentioned constructions of printing mechanisms they do not permit the possibility of securing many carbon copies and for such operations a hammer blow is necessary and which cannot be secured by merely forcing the type against a resilient platen.

The present invention has for its main object the construction of a printing mechanism which will permit the use of type wheels and effect printing by utilizing the type wheels themselves as hammers so as to secure legible printing with one or more clear carbon copies.

This object is attained by first differentially setting the type gear by an operating gear and 5 after such setting cause resilient means to be effective to roll the type gear wheel over the operating gear until the selected type strikes the platen and in the nature of a hammer blow.

Another object of the invention is to devise a construction to mount each wheel individually for independent rocking motion so that the resulting imprint will have even impression characteristics.

A still further object of the invention is to devise a construction of resilient means to cause the type wheel to strike the platen with a hammer blow and then by the resilien means be immediately shifted away from the platen with such timing as will prevent rebound of the type wheel and cause over-printing.

A still further object of the invention is to devise a construction of resilient means to cause a hammer blow by the type wheel that will operate in the nature of a toggle.

' Another object of the invention is to'incorpo- 1i) rate aligning means for the operating gears so that the latter are aligned and locked prior to the rolling of the type gear wheels over the operating gears, insuring that the selected type will squarely strike the platen and thus preventing 15 shadow printing.

Another object of the invention is to incorporate in the novel printing mechanism a means for eliminating the printing of unnecessary zeros and to cause the insertion of zeros in orders lower 20 than the'order in which the highest denominational digit is printed.

A still further object of the, invention is to devise a construction whereby the novel printing mechanism may be split or sub-divided into sepa- 25 rate sub-sets.

Other objects which are relatively important but which are far too numerous to be mentioned herein will be obvious as the specification is understood and all of which are attained in an 30 efficient manner in construction and design and produce a printing mechanism for a tabulating or other machine having very desirable characteristics in performance, operation and simplicity in construction and manufacture, servicing and 35 appeal in commercial requirements.

The printing mechanism is of a type which can be applied to machines of forms other than a tabulating machine in which it is shown as an illustrative embodiment. 40

In said drawings:

Fig. 1 is a diagrammatic view of certain essential elements of a tabulatingmachine for controlling the setting of the printing elements of the printing mechanism, 45

Fig. 2 is a sectional view showing the improved construction of printing mechanism and the main drive therefor,

Fig. 3 is a detail of the clutch mechanism,

Fig. 4 is a detail view of a modification showing a preferred means for adjusting the tension of certain springs used to effect the printing impressions.

The machine in which the present improvements have been incorporated is well known and 55 is exemplified in the patents to Lake No. 1,379,268, dated May 24, 1921; No. 1,600,413, dated September 21, 1926; and the patent to Daly et al., No. 1,896,540. dated February 7, 1933.

In machines illustrated in detail in the above described patents and generally herein, tabulating cards I (Fig. 1) are adapted to be fed singly by a. picker ll from a supply stack to a pair of upper feeding rollers l2 which convey the card so as to have the perforations of the card analyzed by the usual perforation analyzing brushes l3 while the card is in motion. The card analyzed then passes to a lower'set of feeding rollers l4 which then convey the card to a storage hopper, usual in the type of machine referred to.

Card feeding operations are instituted by the usual manual start key designated as ST in the last mentioned patent so as to cause by an electrical circuit the energization of a card feed clutch magnet l5.

The power for driving the card feeding rollers and other parts of the machine is derived from a motor (not shown) which by a belt l6 and pulley l1 constantly rotates a ratchet wheel l9 secured thereto. The pulley l1 and ratchet wheel l9 are loosely mounted upon a shaft I8.

In Fig. 1 there is shown the card feed clutch for causing card feed and is similar to the card feed clutch disclosed in Fig. 1a of the Lake Patent No. 1,822,594, dated September 8, 1931, to which reference should be had for further details of construction and operation.

Upon completion of the electrical circuit to the clutch magnet l the latter attracts its armature 20 to raise a clutch lever 21 to thereby unlatch the latter from a clutch pawl 22. The latter is then drawn by a related spring 23 to engage the constantly rotating ratchet wheel IS. The clutch pawl 22 is carried by a bar 25, which is secured to a disk 26 secured to shaft l8 and to the latter there is secured a pinion 21.

The construction and operation of the card feed clutch, as is well known, is such that upon energization of magnet l5 disk 26 will be rotated and successive rotations of the shaft l8, and therefore pinion 21, will ensue as long as tabulating operations are desired.

The pinion 21 is in mesh with a gear 28 and the latter drives the upper set of feeding rollers l2 and the lower set of feeding rollers 14. The upper set of feeding rollers is intergeared by pinions 28 one of which is rotatable with a gear 30 in mesh with the driving gear 28.. The latter also meshes with a pinion 31 which is rotatable with one of a pair of intergeared pinions 32 carried by the rollers l4 which drive the lower set of feeding rollers 14 in opposite directions. The driving gear 28 is of sufficient width to drive a gear 34 so that by a train of gears 35, 36 a shaft 31 is driven. It is understood that as is usual in tabulatingmachines the card feed clutch is so designed and the gears are so proportioned that shaft 31 will be given a complete revolution in the arrow direction shown in Fig. 1.

It is customary in the'type of machine described to cause printing from type of a printing mechanism which are presented to a printing line in a proper relationship with the analyzing of the index points of the card and to carry out the printing function in a novel manner the improved construction will now be described.

P inting mechanism Referring to Fig. 2 there is shown a printing secured to a shaft 43 which is adapted to bef driven by the gearing just described preferably two and one tenth revolutions for each revolution of the shaft 31, although at times its rotation is interrupted, as'will be explained later, to permit certain functions to be performed.

To the shaft 43 there is attached, for each denominational order, a ratchet wheel 44 and loosely mounted upon the shaft 43 is a pinion 45 meshing with an operating gear 45. Attached to the pinion 45 is a disk 41 to which is pivoted at 48 a clutch dog 49 provided with the usual clutch tooth 50 adapted to be engaged with one of the teeth of the ratchet wheel 44. The clutch tooth 50 is normally held out of engagement with the ratchet teeth by means of a bell crank 5| pivoted on a rod 52. The horizontal arm 53 of said bell crank 5| normally abuts the extremity of the clutch dog 49 to hold the clutch tooth 50 out of engagement with the ratchet wheel 44 and such relationship is maintained against the tension of a normally tensioned spring 54. The vertical arm of the bell crank has a link connection 55 to the armature 56 of a printer controlling magnet 51. The magnet 51, as will be subsequently explained, is energized by an electrical impulse transmitted thereto under control of a card perforation at a differential time and coincident with the analysis of the Perforation.

The magnet 51, as shown in Fig. 1, is in circuitconnection with the analyzing brush l3 so that when the latter encounters a perforation the energization of the magnet 51 -will cause its armature 56 to be attracted and the link 55 drawn to the right, thereby rocking the bell crank 5| so as to release the clutch dog 49 for movement by its spring 54, thereby causing the clutch tooth 50 to engage with one of the teeth of the ratchet wheel 44 and causing by the shaft 43,'.which is now rotating synchronously with the passage of the index points past the analyzing brush l3, the rotation of the pinion 45 and the operating gear 46 a number of steps commensurate with the digital value designated and determined by the perforation sensed.

For each order there is an operating gear 46 which is loosely mounted upon a fixed support rod 58 and each operating gear 46 is in mesh with a type gear wheel 59, each type gear wheel being loosely mounted on a stud 60 carried by a related arm 6| which is loosely mounted upon the shaft 58. To each of the individual arms 6| there is connected a normally tensioned spring 62 the spring acting to rock the arms 6| clockwise but such action is normally restrained by a ball 63.

Each printing gear wheel 53 carries on its teeth raised printing type of all the digits 09 inclusive, so that obviously, the differential actuation of the operating gear 46 will rotate the type gear wheel 59 a commensurate amount. The

rotation of the shaft 43 equivalent to 1 revolution is employed to set the wheels differentially and the timing of the card feed is such as to cause electrical impulses to be directed to the magnets 51 after of a revolution of the shaft.

43 has been effected. It is also clear from Fig. 3 that the ratchet wheel 44 will rotate counterclockwise idly through an angle equivalent to one tooth space after an electrical impulse is sent to magnet 51 before the clutch tooth 58 will engage. Obviously, for the setup of a 9 digit the disk 41 will be rotated nine steps during the remainder or nine-tenths of the revolution of the shaft 43. The purpose of this timing is to secure the proper synchronism between card feed and the rotation of the type wheel so that any digit up to nine can be set up prior to stopping the shaft 43.

After the set up of the type by the shaft 43 the concentric surface 64 of the gear 38 will coact with the Geneva lock projection 65 of the gear 39 thereby causing the shafts 48 and 43 to remain idle during the continued rotation of the main drive shaft 31.

Aligning devices Just prior to the time the type gear wheels 59 have been differentially rotated to represent the value designated on the card a profile cam 66 on shaft 31 which coacts with a roller 67 carried by a pitman 68 will permit a spring 69 connected to the pitman to rock the pitman downwardly, since at this time the roller enters the recessed part of the cam 66. The pitman 68 is connected to a rearward extension I8 of one arm II which together with another arm similar to arm II care ries a bail I2. The bail I2 is provided with slots through which pass the operating gears 46.

Pivotally mounted on a fixed rod I4 is an aligning bar I5 carried by a pair of arms I6 and by means of a rod 11 bent at right angles which is carried by the bar I5 a roller I8 is carried by said bar. A spring I9 attached to one arm I6 of the bar I5 causes the roller I8 to bear against the bail I2. When said bail I2 is elevated the roller I8 will be free of the bail so that the spring I9 urging the bar I5 will permit roller I8 to ride down on inclined projection I3 of the bail to cause the wedge shaped notch 88 of the bar to engage the teeth of the now differentially positioned operating gears 46 thereby aligning them and the type gear wheels 59 in proper differential positions.

Thereafter a cam 8| secured to the shaft 31 will rock a bell crank 82 and since the vertical arm of the bell crank has a hooked connection with the ball 63 by an arm 83 pivoted at 84 to one arm of the bail and hooking over the vertical arm of the bell crank, the cam 8| will rock the ball 63 about its pivot 85. The bail 63 is now withdrawn from locking cooperation with shoulders 86 of the arms 6| permitting springs 62 to rock the arms 6| and in so doing the type gear wheels 59 will roll over the operating gears 46 which are now stationary.

The arms 6| in normal latched position are each so positioned as to effect when unlatched a rolling of the type gear wheel 59 over the operating gear 46 through an angular distance sufficient to cause an impact between a selected type on the type gear wheel and a platen 81. This is effected after the release of the arms 6| by the ball 63, the normal tension in the spring 62 causing the arm 6| to be rocked clockwise about the shaft 58. This tension is effective until the axis of the spring 62 and the centers of the stud 68 and of the shaft 58 are in alignment. At this time the momentum imparted to the arm 6| is suflicient to further rock the arm 6| causing a further rolling of the type gear wheel 59 and during this time the spring 62 will be retensioned so that after the impact between a selected type and the platen the arm 6| will be shifted reversely by the retensioned spring 62 and about the time the spring 62, stud 88, and shaft 58 are again in alignment by means to be subsequently described the arms 6| are positively returned to relatched position. This will eflectively prevent any rebound of the type gear wheels 59 to cause overprinting. The angular relationship between spring 62 and arm 6| causes both to function as a toggle so as to impart considerable momentum to the type gear wheel whereby the type of the latter will strike the platen with a hammer blow, and the relationship shown was found, in practice, to be the best for efficient printing operations.

The numeral type are positioned as shown in Fig. 2 by the numbers adjacent the gear teeth. In the event a zero is to be printed there will be no movement given to the operating gear 46 so that the type gear wheel in rolling over the operating gear 46 will cause the Each printing type will strike an inking ribbon 88 and force it against the usual paper strip surrounding the platen. If a "1 is to be printed the type gear wheel 59 is rotated counterclockwise one step so that in rolling over the operating gear 46 in a clockwise direction the 1 type will effect the printing impression. For printing a "2 the "0 type. to print.'

type gear wheel 59'is rotated counterclockwise two steps, and so on for selecting the other type for printing.

After the printing action the arms 6| are restored to normal relatched position and in so doing roll the type gear wheels reversely to normal position. Each arm 6| is provided with a finger 89 which is beneath an extension 98 of the bail I2. A plurality of extensions 98 are formed integral with the bail, one for each finger 89 of the arms 6|. When the bail is elevated to permit the gears 46 to be aligned the extensions 98 are withdrawn out of cooperation with the fingers 89 so that the arms 6| are free to be rocked. When the printing impression has been made the cam 66 will elevate the pitman 68 rocking bail I2 downwardly, and by the inclined portion I3 cooperating with roller I8 the bar I5 will be shifted to the left to normal position. During this operation the extensions 98 in cooperation with the fingers 89 will rock the arms 6|, and since in the meantime cam 8| has also turned so that it will permit the bail 63 to be returned to normal by a spring, the latter will relatch the restored arms 6| in normal position as the shoulders 86 pass beneath, in readiness for another printing operation.

Zero elimination and insertion mechanism It is, of course, undesirable to print zeros at the left of the digit of the highest denominational order and in the present construction this is effectively prevented by pivoting on a rod 9| a series of zero printing control arms 92 each of which is urged by a spring to engage a restoring rod 94 carried by the arms I6. Each arm 92 has an extension 95 which carries a feeler 96 and a hook 91. Attached to each operating gear I6 is a plate formed with a series of control notches 98 one of which cooperates with the related feeler 96 in the event that the operating gear 46 is not rotated which occurs if the digit entered is zero. When the aligning bar I5 is moved to the right the rod 94 will permit the control arms 92 to be rocked clockwise by their springs and any feeler 96 which enters a control notch 98 will permit the related extension 95 to be rocked sufliciently to cause the hook 91 to engage a lug 99 of the associated arm 6|, thereby preventing the release of the arms 6| in orders higher than that of those above the highest denominational order of the number printed.

However, desirable this may be in the circumstanes just explained, it is necessary to fill in zeros for denominational orders which are at the right of a digit which. is other than 0 and which is printed. For example, in printing the amount -2.03- it is necessary to cause the arm 6| of the tens denominational order to be released to print zero even though no movement has been given to the related operating gear 46.

In the present machine this is effective by providing coupling levers I00 each of which is pivoted at [M to said arms 92. Each lever I00 at its extension thereof is provided with a lug I02 and if the related arm 92 is not rocked due to the fact that some digit other than 0 is printed then said lug will engage an extension I03 of the arm 92 of the next lower order. The arm 92 of the next lower order will thereby be held even though the notch 98 cooperates with the related feel-er 96. Since the related arm 6| can be released for individual operation it follows that the gear type wheel of lower order will cause the insertion of the 0 digit.

Split control mechanism The printing mechanism may be split so that the successive orders may be sub-divided into a plurality of independent sub-sets and this is accomplished by providing each of the coupling levers lllil'with a manually operated portion I04 which is adapted to be rocked so as to prevent the coaction of the lug I02 and the extension I03. This form of split mechanism is well known in the art.

Restoration of type gear wheels to normal position With the present understanding of the operation of the machine, it will be observed that the type gear wheels 59 and operating gears 46 are moved to differential positions if the digit to be printed is other than zero. It will be obvious that after the printing operation the type gear wheels should be returned to normal position and this is effected by a further rotation of the shaft 43 to the extent of of a revolution after it has been temporarily stopped in its rotation during the printing operation.

After the Geneva lock is disabled the gear teeth I05 will cooperate with the gear teeth I06 so as to drive shaft 40 and through the gears M and 42 further drive the shaft 43 of a revolution. For the entry of a 9", for example, the disk 41 has been rotated counterclockwise through an angle equivalent to nine tooth spaces of gear 45 by the first rotation of the shaft 43 so that, in the example assumed, in order to bring the type gear wheel 59 to normal or 0 position the disk 41 should be given a movement of one step and this step of movement is effected at the beginning of the of a revolution of the shaft 43. At the termination of the one step of movement the arm 53 will be contacted by the clutch pawl 49 (since in the meantime magnet 51 has been deenergized) thereby disengaging the clutch tooth from the ratchet wheel 44 permitting the shaft 43 to idly rotate the remainder of the revolution or seven steps.

Obviously if a 1 has been printed by the adjustment of the related type wheel the shaft 43 during its rotation of eight tenths will turn the type gear wheel 59 eight steps-but the ninth step acteristics.

occurs at the start of the next cycle to bring it to normal position. v

Summarizing, during the rotation of the shaft 43 after it has been stopped the type gear wheels 59 are turned complementary amounts to bring them to normal positions.

Adjustment for varying number of carbon copies The upper end of the spring 62 has connected thereto a spring clip as shown in the modification in Fig. 4 which comprises lateral projections I01 fitting in the convolutions, and a center rod I08 which has a hook I09. Through said hooks a rod IIO passes. The rod H0 is carried by bent projections III of a plate II2 which is slidably mounted on a bar I I4 and fixed in adjusted posi tion by screws II3 passing in the bar II4.

Obviously the spring clips can be rotated more or less so that the initial tension of spring 62 can be selected to cause even impression char- Such adjustment is preferably made in manufacture and for collective adjustment of a series of springs 62 the plate H2 is adjusted for the desired number of carbon copies. By shifting plate II2 upwardly from the position shown, the series of springs 62 is collectively increased in length and tension and at the same time the angle is changed so as to increase the impact between the platen 81 and type gear wheels 59 when more carbon copies are desired. A scale may be provided to indicate the necessary adjustment of the plate II2, as shown in Fig. 2.

While there has been shown and described and pointed out the fundamental novel features of the invention as applied to a single modification it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention, therefore, to be limited only as indicated by the scope of the following claims.

What is claimed is:

1. In a printing machine, in combination, a platen, a plurality of type gear wheels in axially aligned position and each mounted for a rolling movement about its axis and a rocking motion about a pivot from the axially aligned position to select a type for printing and to cause the se lected type to impact said platen, means for differentially setting said type gear wheels while in axially aligned position, and a single means for each type gear wheel comprising a normally ten sioned spring for causing the type gear wheel to roll about its axis and during such movement rock about its pivot from its axially aligned position to cause the selected type to impact 'said platen.

2. In a printing machine, in combination, a platen, a plurality of type coaxially aligned gear wheels mounted for rocking motion about a pivot, means meshing with said type gear wheels for differentially setting said type gear wheels while the latter are in aligned position and mounted upon said pivot, and a single means one for each type gear wheel for causing said type gear wheel to roll about its axis from its axially aligned position over said setting means and to effect a rocking motion to impact said platen.

3. In a printing mechanism for a machine for listing data, in combination, a series of type printing cylinders, a pivoted arm for carrying each cylinder, means mounted on the pivot of said arm for setting said type cylinders to select predetermined type, a platen, means comprising a bail engaging each of said arms for holding said means in'said machine for releasing said bail at J a predetermined time in the machine operation to cause the simultaneous movement of said type cylinders bysaid springs to independently im-' pact said platen, and means for locking said-setting means against movement to cause each cylinder to roll about its axis when the type cylinders are released to impact said platen.

4. In a machine of the class described, in combination, a plurality of operating gears, means for causing the setting of the operating gears differentially to rest positions, a plurality of gear type wheels meshing with said operating gears and rotated thereby during the setting of the latter to select type thereon, means for mounting each of said gear type wheels to roll about its axis, a platen, and resilient means effective after the operating gears are at rest positions for calls ing the gear type wheels to roll about their axes to impact said platen with a hammer blow.

5. In a machine of the class described, in combination, a plurality of operating gears, driving means for said gears, means for causing the driving means to set said gears to differential positions, a plurality of gear type wheels meshing with the operating gears and rotated thereby during the setting of the latter for selecting type on said gear type wheels, means for mounting said gear type wheels to roll over said operatinggears, a platen, normally ineffective resilient means for causing the gear type wheels to roll over said operating gears to impact said platen, and means operated by said driving means for causing the resilient means to be effective.

6. In a machine of the class described, in combination, a, platen, operating gears, gear type wheels meshing with the operating gears, means for setting said operating gears to rotate the gear type wheels to differential positions, means for mounting said gear type wheels to roll over said operating gears, normally ineffective resilient means for causing the gear type wheels to roll over said operating gears to impact said platen, means for restraining the action of said resilient means, and means for disabling said restraining means at a predetermined time in the operation of the machine.

7. In a machine of the class described, in combination, a plurality of operating gears, a plurality of type gear wheels, individual means for mounting said type gear wheels for rolling the type gear wheels over the operating gears, a platen, normally ineffective resilient means for individually causing the type gear wheels to roll over the operating gears to propel the type gear wheels against the platen, means comprising a bail engaging said mounting means for restraining the action of said resilient means, and means for operating said bail to cause said resilient means to be efi'ective.

8. In a machine of the class described, an operating gear, a gear type wheel mounted for a rolling movement over the operating gear, means for setting the operating gear difierentially to select a predetermined type by an initial rotation of the type gear wheel, a platen, and means for causing said type gear wheel to roll over the operating gear to supplementally rotate the type gear wheel to cause the selected type to impact said platen.

9. In a machine of the class described, in combination, operating gears, a plurality of gear type wheels mounted to roll over said operating gears, means including said operating gears to initially rotate the gear type wheels forwardly to differential positions to select type, a platen, and means for causing the gear type wheels to roll over said gears after their initial rotation to cause the selected type to impact said platen.

10. In a machine of the class described, in com-- bination,- a plurality of gear type wheels, arms for carrying said wheels, means for initially rotating said wheels to differential positions to select predetermined type, a platen, resilient means for causing said gear type wheels to roll about their axes to impact said platen, abail cooperating with said arms, and means for moving said bail to position to release said arms for action by said resilient means at a predetermined time in the operation of the machine.

11. In a machine of the class described, in combination, a type gear wheel provided with type which are selected for printing, a platen, a pivoted arm for mounting said type gear wheel, a normally tensioned spring connected at one end to said arm, anchoring means for securingthe other end of said spring to provide by the location of said anchoring means a normal angular relationship between the axis of said spring and said arm so that as the normal tension is released it causes the rocking of said arm to cause the type gear wheel to be moved towards said platen, said spring thereafter being retensionedby said arm as the momentum imparted to said type gear wheel causes it to be further moved to impact said platen, and means for reversely rocking said arms to thereby cause the normal tension in said springs.

12. In a machine of the class described, in combination, a platen, an operating gear, a type gear wheel, means comprising an arm for mounting said type gear wheel to roll over said operating gear, means for causing said operating gear to rotate said type gear wheel to select a type, and a normally tensioned spring connected to the arm, anchoring means for securing the other end of the spring to provide by the location of said anchoring means a normal angular relationship between the axis of said spring and said arm so that as the normal tension of the spring is relaxed it causes the rocking of said arm to cause the related type gear wheel to roll over the operating gear, said spring being then re-tensioned by said arm as the momentum imparted to the rolling type gear wheel causes it to impact said platen.

13. In a printing machine, in combination, a platen, a plurality of type printing elements, a revoluble shaft revolving in the-same direction two rotations for each machine operation, setting and restoring means for said type printing elements including said shaft and operable thereby during the first rotation of said shaft for setting said type printing elements and during the second rotation to restore said type printing elements to normal, means for causing said type printing elements to impact said platen, and means for causing the interruption of the first rotation of said shaft while the last named means is operating.

14. In a printing machine, in combination, a plurality of type printing elements, a revoluble shaft revolving in the same direction two rotations for each machine operation, setting and restoring means for said type printing elements including said shaft and operable thereby durin; the first time said shaft is rotated for setting said type printing elements, and during its second rotation restore said type printing elements to normal, a platen, means for causing independent rocking motion of said type printing elements about a pivot to impact said platen, and means comprising a Geneva drive for causing the in-' terruption of the first rotation of said shaft while the last named means is operating. I

15. In a printing machine, in combination, a platen, card analyzing means, a plurality of type printing elements, a revoluble shaft revolving at two different times for each machine operation, means including said shaft and under control of said analyzing means for setting said type printing elements during the first time said shaft is rotating, means for causing said type printing elements to effect a rocking motion about a pivot to impact said platen, and means for causing the interruption of rotation of the shaft during the operation of the last-named means, said shaft thereafter during its second rotation restoring the type printing elements to normal.

16. In a printing machine, in combination, a platen, a plurality of type wheels mounted for a rocking motion about a pivot to impact said platen, individual springs normally tensioned for causing said rocking motion of said type wheels, means for individually adjusting the tension of said springs, and means for collectively varying the tension of said springs to vary the impact between said platen and type wheels.

1'7. In a machine of the class described, in combination, a type gear wheel, means comprising a rockable arm for carrying said type wheel, a normally tensioned spring connected to said arm. anchoring means for securing the other end of the spring to provide by the location of said anchoring means a normal angular relationship between the axis of said spring and said arm so that the rocking of the arm in one direction rclaxes the tension of said spring and then the further rocking of said arm in the same direction rctensions the spring, and means for reversely rocking said arm to cause the normal tension in said springs.

18. In combination, a platen, an arm, a type gear wheel mounted on said arm for a rocking motion about a pivot of said arm to impact said platen, a setting gear meshing with the type gear wheel for initially rotating said type wheel gear and mounted on said pivot, a normal tensioned spring connected to said arm, anchoring means for securing the other end of the spring to provide by the location of said anchoring means a normal angular relationship between the axis of said spring and said arm so as to cause both a rolling movement ofthe type gear wheel about its axis over the setting gear subsequent to its initial rotation, and the rocking motion of the arm to cause said type gear wheel-to impact said platen, and means for reversely rocking said arm to cause the initial tension in said spring.

19. In a machine of the class described, the combination with a plurality of numeral type wheels, of means for analyzing aperforated record, means controlled by said analyzing means for effecting an initial rotation of said type wheels synchronously with the analysis of the perforations to select certain numeral type but not to present desired numeral type to a printing line, and means for causing a supplemental rotation of said type wheels to present desired numeral type which are representative of the numeral representing perforations analyzed to said printing line.

FREDERICK L. FULLER. 

